Feeding of steam-boiler plants



May 7, 1929 w. STENDER Filed Sept. 16. 1924 FEEDING OF STEAM BOILER PLANTS 2 Sheets-Sheet '1 M51 ma/MM KW 'May], 1929. g v 15111.659-

FEEDING STBAM BOILER PLANTS Filed Sept. l6. 1924 2 Sheets-$116 91} 2 I Figs. 2 and 3 Patented May 1929.

UNITED STATES.

PATENT OFFICE.

WALDEMAR STENDER, BERLIN-CHARLOTTENBURG, GERMANY, ASSIGNOR TO SIE-f MENS-SGHUCKERTWERKE GESELLSQHAIT MIT BESCHRANKTER HAFTUNG, OF SIEMENSSTADT, NEAR'BERLIN, A CORPORATION OF GERMANY. v

- :FEEDING or STEAM-BOILER rranrsi Application filed September 16, 1924, Serial No. 737,999%, and in Germany September 22, 1923.

, 'My invention relates to improvements in the feeding of steam boiler plants.

NVhen steam boilers are fed in such 'a manner that the Water 'is first heated in an 'economizer or waste gas feed heater and then by surplus live steam, two hot water storage receptacles orvessels are required,

one behind the economizer and the other behind the steam heater. This is necessary because the Water must be passed approximately uniformly through the economizer but through the steam heater to the extent onlv to which steam is available, while the boiler must again be fed approximately uniformly. A larger quantity of .water is furthermore necessary to condense the same,

quantity of steamthan required if the Water had not been heated in an economizer because more steam can naturally be condensed with cold water than with hot water. Consequently the storage receptacle for the water preheated by steam must be also made larger when heating the -water in'an ccono-' mizer than without such a heater.

To obviate these disadvantages the system of feeding boiler plants according to my invention provides that a portion of the feed water is heated in an economizer while another portion is heated by steam. In the drawings aflixed to this specificaembodiments of my invention are illustrated by way of-example.

In these drawings: Fig. 1, shows a diagram of the improved feed system and show diagrams of' slightly modified systems. Similar reference characters indicate similar parts throughout all 4.0 the fi ures of the drawings.

Ref

the feed water 3 of which is raised by the pumps 11 and 21. The pump 11 forces the feed water through the economizer 12 into '45 the, boiler 1 and the'pump 21 drives the feed Water through the steam heater 22 into the hot water storage receptacle 23 whence the pump 24: also raises it into the boiler l.

If little steam is used at the place of consumption' a the pressure in the pipe 5 rises.

In dependence therefrom" the valve 6 is opened by means of pressure responsive element 40 operating control rod' 41, and the surplus steam flows into the steam heater tion and forming part thereof a number of erring to Fig. 1, l is a steam boiler brought to the same temperature since to a certain quantity of water the corresponding. quantity of steam is always added. The

storage receptacle 23 is thus chargedirregularly but emptied regularly by the .pump 24,

the water being forced into the boiler l in a uniform stream. a a

- In the improved system or arrangement according to, my invention not the total quantity of waterfioWs through the economizer but asmaller quantity. The water therefore flows slower and becomes more highly heated; The quantity passing mustbe so regulated that the water isnot heated beyond the boiling temperature prevailing in theboilr. This control is very simple, in my lmproved system since the battery of boilers is quite uniformly, fired and the pump 11 delivers uniformly. For greater safety the output of pump 11 may also be regulated in dependence from the temperature of the feed water behind the economizer 12 either. by hand or by a thermoregulator. For regulating the total quantity of the water to be fed into the boiler thepump 24: can be controlled from a water level regulator in known manner. means will be referred to hereinafter with reference to Fig. 2.

By the system according to my invention not only the storagejreceptacle behind the,

economizer is rendered superfluous but the further advantage isobtained that the storage receptacle or reservoir 23 and the pum 24 can bemade smaller than if they had to deliver the water already preheated by the economizer because for the condensation of the same quantity of steam less cold water is required than already preheated water,

as will be readily understood.

The savings which can be effected by the heating of the feed Water are naturally greater the higher are the temperatures attained thereby and the tendency will be to raise the heating as near as possible to the boiling point of the boiler water.

Frequently it happens, however, that the economizer is not able to sustain the boiler These pressure, for instance in the event-that it is desired to utilize as waste gas heater for a high pressure boiler plant an old low pressure boiler alone or in'conjunction with a waste gas heater or economizer already installed for this lofi pressure boiler. According to my invention it is possible to arrange-in such a case means which bring the Water, heated in the economizer system to the pressure of the'water in the high pressure boiler, or to arran 'e between such an economizer system and the water heated by steam a supply means which bring water heated in the economizer to the pressure .ofthe water heated by steam. Provisions may also be made that the hot water or the surplus of hot water produced in the economizer is conducted to the storage receptacle for the water heated by steam.

Embodiments of this part of the invention are shown in Figs. 2 and 3.

Referring .to Fig. 2, 10 is a low pressure steam boiler serving as additional ecoiiomizer to WhlCl'ltllB feed Water'3 is supplied by the pump 11 by way of the economizer 12. The high pressure boiler 1 whose steam is conducted to the consumer 4 by the pipe 5 is fed by. the pump 31 partly with hot water from the low pressure boiler 10 and partly with water from the hot water storage vessel 23; The-houwater storage vessel 23 is charged with water which is supplied to it by the pump 21 by way of the steam heater 22. The steam passing to the heater 22 is controlled by the valve 5 operated, as in Fig. 1, by the pressure responsive means 40 through rod 41 in dependence from'the steam pressure in the main: pipe 5.

The output of pump 31 is regulated in dependence from the water. level in the high pressure boiler 1 in any conventional manher, for instance by a float 44, disposed in boiler 1 and acting thru control rod 45 upon a valve 46. The "output of pump 11 is regulated in dependence from the temperature behind the low pressure boiler 10 and the pump 21 in dependence .from the temperature behind the steam heater 22. For these purposes a temperature responsive control.

element, of any suitable. construction known in the art, is located at the delivery side of 'low pressure boiler 10, which element to the pump 31 so that the pump 31 takes the missing quantity from the hot water storage receptacle 23 through-the pipe 13.

If the firing of the boiler -1 is suddenly decreased because the high steam consumption ceases the evaporation in the boiler drops considerably and consequently also the output of the pump 31*wh'1ch is controlled by float 44, while the temperature of-the water issuing from the economizermay still remain almost unchanged so that there is noreason for a change in the output of the pump 11- which as stated before depends upon the temperature on the delivery side of boiler 10. It may happenas a consequence that the pump 11 supplies more water than the pump 31 requires. The excess of Water then flows to the'storage vessel 23 through the pipe 13.

Referring to Fig. 3, it will be observed that the water heated in the low pressure boiler 10 is brought to thefiressure of the water heated with steam by the pump '31 the Water being fed into the hot Water storage vessel 23 by said pump." The pump 31 can be regulated in a similar manner as the pump 11 namely in accordance with the temperature behind low pressure boiler 10 (not shown). A pum 41 then-feeds the high pressure boiler 1 1mm the hot water storage receptacle 23 in dependence from level in the boiler 1.

the water What I claim asmy invention and desire to secure by Letters Patent is 1. A feed system for 'boiler plants comprising a waste gas heater adapted to heat one portion of the feed water and a live steam heateradapted to heat the other portion of the feed water, means for controlling the quantity of the live steam entering said steam heater in dependence from the steam pressure in themains and means for controlling the quantity of water flowing through said steam heater in dependence from the quantity of the steam available for its heatmg;

2. A feed system for boiler plants comprising. a waste gas heater/adapted to heat one portion of the feed water and a live steam heater adapted to heat the other per tion of the feed water, and means for controllin the quantity of the water flowing through the waste gas heaterin dependence from the temperature of the water behind said heater.

3. A feed system for boiler plants com prising a waste gas heateradapted to heat one portion of the feed water and a live steam heater adapted to heat the other portion of the feed water, means for controlling the' quantity of the live steam entering said steam heater in dependence from the steam pressure in the mains and means for controlling the quantity'of the water flowtion of the feed water, means for controlprising a waste gas heater "adapted --to heat) 5 one portion of the feed Water and ,a live steam heater adapted to heat the other por-' ling the quantity of the water flowing through said steam heater independence from the quantity of the steamavailable for v "intermittently the otherportio'n of the feed its heating and means for controlling the quantity of Water flowing through the waste gas heater in dependence from the temperatureof the water behind said heater.

5. A fcedsystem for boiler plants com prising a waste gas heater adapted'to heat one portion of the feed water and a live steam heater adapted to heat the other por through said steam heater in dependence -irom the quantity'of the steam available for I steam heater adapted to heat the other por-' tion of'thefeed water, meansfor controlling the j quantity of the live steamv entering said steam heater independence from the steam pressure in the mains, means for controlling the "quantity of water flowing its heating and means for controlling the quantity; of'the water flowing through the waste gas heater independence from the temperature of the water behind said heater.-

6. A feed syste'm'for boiler plants com prising a waste gas heater adapted to heat one POlftion of the "feed Water and a live tion of the feed water, a connection between the discharge sides .of both water heaters and a pump in said-connection -for raising the pressure of the water heated in the waste gas heater to pressure of the water heated in the live'steam heater.

7. Afeed system for boiler plants com prising a Waste'gas heater for heating substantially continually one portion of the feed water and a steam heater for-"heating intermittently the other portion of the feed water, means fonfeeding b'oth portions to the, boiler ,.mea'ns for controlling the quantity of for the water heated by steam.

steam entering said steam heater and means prising a waste gasflheater for heating substantially continually one portion of the feed water andfa steam heater for heating water, means for feeding both portionsato the boiler, means for controllingithe quan tity ofsteam entering said steam-heater and meansfor controllingflthequantity of water flowing through said steamheater and means for regulatino'. both of said controls in dependence of lie quantity of steam available for heating purposes and a storage vessel 9. A feed system for boiler lantsjcomprising a wastegas heater for eating substantially continually one portion of the 4 feed water and a steam heater for heating intermittently the other portion of the feed water, means for feeding both'portions to the-boiler,- means for controlling the quanray of feed, water flowing "through saidv steam heater, and means for actuating said quantity control mea'nsf'in accordance with the amount of steam availableior heating.

- for controlling the quantity pfwater flowing 10. A feedr-system fol-boiler plants, com- I prising a. waste gas heater for heating silbstantially continually one portion of the feed water and a steam heater. for heating intermittently the other portionzof the feed water, meansfor feeding both portions to the boiler, means for controlling the quantity "of feed ,water flowing through said steam heater, and means for regulating\the steam supply to said steam heater in. ac-

cordance with the amount of steam avail v able for heating.

In testimony whereof ailiz; my signature. "1

. wimemisamma} 

